Infernal Duelist

You use the preferred weapons of the Archdevils you learned from. You have the Weapon Mastery properties for the Rapier. While using a Rapier with a free hand you can use the Parry reaction to give yourself AC equal to your Proficiency Bonus.

The first time you hit a creature with a weapon attack each turn you deal them 1D4 Psychic damage. The next time the creature dealt damage this way would make a D20 test they subtract the result of the Psychic damage taken. They can only have one instance of this penalty at a time.

You learn to lace your words with enchantments. You know the cantrip Vicious Mockery.

You imbue your weapon of choice with more mental energy. The Psychic damage you deal is increased to 1D6.

You have proficiency in Persuasion and Intimidation. Whenever you succeed a check of those types, the target has disadvantage on their next Insight or Deception check.

You further imbue your weapon with caustic psychic energy. The Psychic damage you deal is increased to 1D8.

You unleash a scathing torment of putrescent hatred that would make a devil lord blush. You can use this feature as an action once per long rest forcing a target that can hear you within 60 ft to make a DC 8 + your CHA modifier (Minimum 1) + your Proficiency Bonus CHA check and on a failure they are Stunned until the end of their next turn. A creature Stunned this way has disadvantage on INT, WIS, and CHA saving throws until they are no longer stunned.

You pour even more mental energy into your weapon. The Psychic damage you deal is increased to 1D10.

The psychic energy within your weapon seeks to harm those you hit. You roll with advantage on your Tormenting Rapier damage.

Your wicked hatred is poured into your rapier. The Psychic damage you deal is increased to 1D12.

Your devilish vocabulary and mental energy has increased with practice. You can use Wicked “Banter” three times per long rest.

You can choose which D20 test will be affected by your Tormenting Rapier. Until the selected roll is made, the debuff results will accumulate each turn until the roll is made or one minute has passed. You can only target one target with one roll each.